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12-(x-10)=2,4


3,(2)+x<9,(7) in N


Răspuns :

a)12-(x-10)=2.4⇒12-x+10=2.4⇒-x+22=2.4⇒-x=-22+2.4⇒-x=-19.6/(-1)=x=19.6
sucees
12-(x-10)=2,4|+(x-10); (x-10)+2,4=12|-2,4; x-10=9,6|+10; x=19,6; 3,(2)+x<9,(7) in N; 3,(2)+x<9,(7)|-3,(2) x<6,(5) x=0,1,2,3,4,5,6